An important question is how well competitive models approximate models of large finite economies. For a class of differentiated products models, static Nash equilibria, if they exist, always converge to competition as the number of firms increases. Dynamic Nash equilibria need not so converge....

A supergame theoretic price-setting model of collusion is calibrated to data from the North American passenger car market before, during, and after the voluntary restraint arrangements (VRAs) with Japan. Conclusions about whether the model is consistent with the bans from the various regimes...